lemmy/server/migrations/2020-08-25-132005_add_uniqu.../up.sql

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-- Add unique ap_id for private_message, comment, and post
-- Need to delete the possible dupes for ones that don't start with the fake one
delete from private_message a using (
select min(id) as id, ap_id
from private_message
group by ap_id having count(*) > 1
) b
where a.ap_id = b.ap_id
and a.id <> b.id;
delete from post a using (
select min(id) as id, ap_id
from post
group by ap_id having count(*) > 1
) b
where a.ap_id = b.ap_id
and a.id <> b.id;
delete from comment a using (
select min(id) as id, ap_id
from comment
group by ap_id having count(*) > 1
) b
where a.ap_id = b.ap_id
and a.id <> b.id;
-- Replacing the current default on the columns, to the unique one
update private_message
set ap_id = generate_unique_changeme()
where ap_id = 'http://fake.com';
update post
set ap_id = generate_unique_changeme()
where ap_id = 'http://fake.com';
update comment
set ap_id = generate_unique_changeme()
where ap_id = 'http://fake.com';
-- Add the unique indexes
alter table private_message alter column ap_id set not null;
alter table private_message alter column ap_id set default generate_unique_changeme();
alter table post alter column ap_id set not null;
alter table post alter column ap_id set default generate_unique_changeme();
alter table comment alter column ap_id set not null;
alter table comment alter column ap_id set default generate_unique_changeme();
-- Add the uniques, for user_ and community too
alter table private_message add constraint idx_private_message_ap_id unique (ap_id);
alter table post add constraint idx_post_ap_id unique (ap_id);
alter table comment add constraint idx_comment_ap_id unique (ap_id);
alter table user_ add constraint idx_user_actor_id unique (actor_id);
alter table community add constraint idx_community_actor_id unique (actor_id);